Improvement in hand-hole joints fob boilers



6r. W772i@ Hezfd -HoZe Jamie; fb? 502km. /T 75 55 7 *.Rim fea? Jani/M868@qw/fw v /zz niter gitane @anni @Hire GLLBERT WHITE, oE EARLEM', NEWYORK, ASSIGNOE To HIMSELE AND GUSTAVUS PIEREEZ, or NEW YORK CITY.

Letters Patent No: 73,557, dated January 21, 1868.

IMPROVBMENT'IN HAND-HOLE' JOINTS FOR-BOIIIERS.

To AEL WHoM 1T MAY ooNoERN:

Beit known that I, GILBERT WIITE, of Harlem, in the county of New York,and State of New York, have invented a new and improved Hand-Hole Coverfor Steam-Boilers; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable those skilled inthe nrt to make and use the same, reference being hadtothc accompanyingdrawings, forming part of this specification. i

iThis invention consists in amoditication in the packing or gasket ofahand-hole cover for steam-generators, as hereinafter fully shown anddescribed, whereby a tighter joint is obtained than hitherto, and th'epacking or gasket rendered less liable to become injured or deranged inapplying the cover to the hole, and taking it therefrom. In theaccompanying sheet of drawings- Figure 1 is-a longitudinal centralsection of my invention, taken in thc line xx, fig. 2.

Figure 2, a face view of the same.

Similar letters of reference indicate corresponding parts.

A represents the head of the cover, which ma be constructed of cast orwrought iron, having a wroughtviron stem, B, firmly fitted in it, andprojecting from it at right angles, as shown in iig. 1. The face side,a, of this head, is n. plane surface, and upon it the packing C isfitted, covering the whole surface of a, a hole being made centrallythrough the packing, to allow the stem B of thc cover A to puss tl1roughit. On the packing C there is fitted a plate, D, a hole. being madecentrally through D, to allow thc stem B to pass through, and a key, ax,passing through the stem, to keep the plate in position. The stem, nearthc face side a of the cover, il made square, and a square hole is madein the packing and plate, for the square part ot' the stem to t in, so'as to prevent the packing 'and plate from turning on the stem. Thecover is fitted within the boiler, the edge of the packing lapping overthe edge of the hole in the boiler-plate, the plate Dvbeing sufficientlysmaller than the cover to admit of this. The cover is drawn against theinner side of the boiler, by a nut bearing against a i crow-foot on theouter side of the boiler,as sli-own in red, iig. l, the packing beingthereby clamped between the boiler and the cover, forming a tight joint.

,A 'By this simple improvement the packing is kept in good condition,and the cover *may b'e applied to and taken from the hole in the boilerwith the greatest facility, and in the event of leakage, wedges maybeinserted between the edge of tbe gasket and the faceof the cover, withbut little trouble', and a prope'r pressure of the packing against theedge of the hole obtained, so as to effectually stop leakage. .Theordinary packing is an oval ring, which is very liablevto get injured inapplying the cover to the hole in the boiler, and d'ctaching littherefrom. It .frequently sticks to the boiler, and in removing thecover, will frequently get curled over and damaged, so as toibe veryunreliable when aga-in applied.

I claim as new, und desire to secure by Letters Iatent- The packing C ofthe face a, and the cover A, in combination with the plate D, allconstructed and arranged substantially as shown and described. y

' GILBERT WHITE..

Witnesses:

WM. F. McNAMARA, ALEX. F. ROBERTS.

